package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * @author 何须浅碧深红色
 * @date 2022/9/14
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());
        //获取源文件名包含后缀名
        String originalFilename = file.getOriginalFilename();
        //动态获取文件的后缀名
        String substring = originalFilename.substring(originalFilename.indexOf("."));
        //uuid随机生成文件名
        String UUIDString = UUID.randomUUID().toString()+substring;
        File files = new File(basePath);
        if (!files.exists()){
            files.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+UUIDString));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(UUIDString);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
